CNN Money reported that it’s the first time the company is using caramel as a permanent filling. M&M has a history of trying out different flavors, and occasionally a new filling, such as peanuts, or pretzels. But a caramel center is very different.

"Caramel is extremely trendy," Vice-President of Research and Development of Mars Chocolate Hank Izzo told CNN. "It's a $2.2 billion flavor segment and the fastest growing segment in food right now. We want to be part of this category."